The social media giant announced it would restrict the advertising of weapon accessories, such as optics, belt accessories and holsters, to those over the age of 18 … This means we have an even higher standard for what is allowed and why we have chosen to limit weapons accessories to an adults only audience,” Facebook said in its blog post … Facebook has banned the sale of firearms and ammunition on the platform since 2014, but there has been pressure on major companies to act on gun control following school shootings in Santa Fe and Parkland earlier this year.